Sawmill carriage



March 4, 1930. G. M. PELTON 'SAWMILL CARRIAGE Filed Nov. 12, 1929 I P at-ented Mari 4, 1930 f UN TED STATES,

"PATENT. .o Frtc GEORGE mrnn'ron, on ninwauxnnwisconsin, ,assrsnon Tori-tn FILER & STOWELL co, or MILWAUKEE, wrsconsrn a coaronnrronor WISCONSIN SAWMILL CARRIAGE i Application filed November 12, 1929. Serial No. 406,666.

' v This invention is directed to an improvementinmeans for limiting the movements ofthe dogs of a saw millcarriage to prevent thedogs from reaching the saw line without 1 in :any way: interfering with the usual limit travelaof the knee toward the saw line. v

; The invention is particularly applicable to thatvvv type of dogging meohanismin which I c the dogs aretadapted for-either a minimum projection beyonduthe. face of the knee or a' maximum projection beyond'the faceof the knee,the position of the dogs being man uall'y controlled andva djusted at will-to suit the particular conditions of dog use. Obvi- ,--,15 ously,--wherethe-dogs are capable of minimum or maximum projection beyond the face of'the knee, anymeans to limit the movement of ithe dogs toward the savv line to thereby preventthev dogsfrom entering the saw line 1520 mustytake into consideration the difierent relative .positionsxof theidogs relative to the g faceof -the"knee,for if the knee was, interrupted'in its travel-toward the saw lineso as to prevent the dogs at their minimum projection from being'engaged by thesaw,

obviously the dogs when-projectedto'their maximum degree. would reach the saw line before the forward" movement of. the knee c was completelyinterrupted. Conversely, if

'3 0 the knee interruption was providedfor .to take, care'of the dogs when projected-their 7 maximumgjdistancebeyond the face of the knee,.the-kneetravel would be stopped long '1 before the dogswhenat their minimum pro-- jection could enter: the saw. line. :Thus, no

positive stopv cooperating with the kneealone can-properly take c'are of both conditions.

- hfllhe invention 1s more particularly concernedwiththat type of dog'operating mech- 4 anism wherein a frame, bywwhich, the dogs 'aregcarriedandon Whichthey arerelatively ven'iea11ym0vab1e forthedoggingoperation,

islfrnounted for movement: toward and; from the face of," the knee,-:so that the dogs carried by: .themframe. may. baprojected to greateror. y

j a dog limiting means in the form of a rigid 7 face of the knee.

In my co-pending application Serial. No. 348,322, filed March 19, 1929, I have shown arm extension from one of the operating cranks'for the frame, with this arm extension cooperatingwith a stop onthe headblock to limit the movement of the dogs relative to the saw line without regard to the degree of projection of theidogs beyond the face of theknee ascontrolled by the frame. Such rigid construction, however, while effective, will, necessarily, owing to itsirelatively angular movements under frame adjustment, cooperate with the fixed stop of the head block at different angles. and while nevertheless effective as a stop, does not present that effective abrupt control of the dogs advisable in a construction of this, kind.

The primary objectof the present invention, therefore,'is'to provide a dog limiting element which is directly positioned for dog control operation in the adjustment of the frame by which the dogs are moved to their minimum or maximum projection beyond the face of the knee, with this dog limiting means so mounted as to remain in all possible positions of the frame with its operating stop or free end at substantially rightangles to thehead blockstop to insure the most effective and least wearing operation of the parts in service I I c The invention, more particularly described, includes an element mounted on and fonmovement withrespect to one of the V frame-supporting cranks, so that asthe stopelement, however, is connected through an individual crank mounting with the knee,

this individual crank mounting remaining in parallelism with the crank cooperating i with the frame, so that the stop element remains at all times in a predetermined position with respect to the plane of the stop caririedby the head' block While at the same time I shiftable with theframe as the latter 1s op-- erated to positionthe dogs relative to the face of the knee. Theinvention is illustrated inthe azcconr panying drawings, in which:

Figure 1 is a broken view in elevation,

' showing the improvedconstruction.

' v Figure 3 is a View showing'the lower crank Figure 2 is an enlarged perspective view", showing the lower crank mounting forthe frame and the connection therewith of the improved stop element.

mounting. a I p ;(In the form'illustrat'ed; the*knee:1,movable-on andwith respect't'o thehead block 2, is provided with a' frame 3, preferably in the form of a" bar-like element; withthis frame supported-on upper and lower cranks 4 and 5"mountedin the knee. The dogs, indicated at 6, are movable longitudinally of: tlie" frame and relative to eachother forth'e, dogging operation; it being understood that means, preferably power means, are provided for shiftingthe frame and thereby the'dogsw'ith respect tothe face of the knee; and further means,"pre'ferably power means, are provided fonmoving the dogs relative to each-other and with respect to the framefor thedogging operation. This construction is more or less conventional andfwell understood and only "suflicient thereof is illustrated to give a comprehensiveunderstanding ofthe specific improvement relative to the stop element.

It'vvillbe appreciated that'the log or cant;. held to the face of theknee by the dogs is advanced toward the saw at each successive sawin'goperation and that if the dogs have been projected to their maximhm distance, it

7 j is quite ,possible,in the absence of a protecting means, that the'dogswillcross the saw linea'dvanceof the knee. This'li'ability of the dogs encroaching upon the' saw line is practically present in any possible log orcant holding position of the dogs, for while itis v conventionally understood that thekn ee" is limited in its movement on the head block,-so that such knee cannotcross'the saw line, yet the limitapp'roach of the' knee to the sawv line is, in order. to provide for effective board sawing; so'closeito such saw line that any sub stantial projection of the dogs would project said dogs; in the absence of limiting means,

into the saw line.

tolremain .in-the log or: cant withfn'll holding j Of. course," a limiting means to be 'efiective mu's'tpermit the dogs effectup to a pointimmedia'tely'short ofthe saw line. and: as this. limiting position of the dogs will; of course; materially vary in ac stop arm, and a lateral a"rnf1""l-2 on the head block 2 inthe ofthe stop element l7; I 1 k i I V j Inthe adjustment oftheframeto' project cordance with the projection of the dogs beyond the face of the knee, it is apparent that the, limiting means, in its effective application, must in itself compensate for the differ: ent positions of the dogs beyond the face of the knee and must be effective to interrupt the movement of the dogs With the knee as said dogs approach the saw line, no matter what the projection of-the dogs beyond the face i of the knee may be. 7 to V Inthe application above referred to, the

limiting means is shown as a rigid extension of one of the cranks, the free end of which extension is designed to cooperate with the stop on the head block. In'this'; form; the

rigid connection or arm will; of course, move with the crank which controls the movement of the frame, that is, the position of the rigid connection or arm will be movedin correspondence with the projectioniof the dogs with respect to the face of thekneeb i r Asthis arm, h'OWBVBIQjS 'EL rigid'exten'sion' of one of j the cranks,'the'angular relatlonofzthe frame end of the arm with respect to the stopfion the'liead' block varies in the different posi -j tions of the arm, and this;is jobjectionable bothfrom the standpoint of undue wear the further objection of the angular: relation of. the arm and stop, tending: to a some what less effective interrupting: influence surfaces, of the stopyand extension are brought into flat contact-for stopping pur- V 7 Carr 5 'g he present inventionyithe shaft: 7 forming partjoffthe'lower crank 5 V 1 h ismou'nted in thei spa edz q l i f h i x than where comparatively broad portions or 1 knee, is providedibeyond one surface of'the kneexwith; a crank extension 8*which,' being 11335 rigid with the shaft 7, is in exactfcorre spond ence withit-he crank 55in the'movementofthe frame; Pivotally supported-at tliefllower similar in length and their'respective m'ount ings and the length of th'e arm 12 areqsucli that thegcran'k extension 8 air'i'dllill'kv 4 re:

main parallel in allimovements of the crank eXte-nsion'8; The lower endofthes'top' arm" '11 is turned downwardly to present a-ve'rtical' extension 16, and an adj u'stable stop. element link 14 17 is threaded transverselywith the portion 7 16"of the st'parin; 'A stop Isis-arranged,

path of inovenrent the dogsto the minimum' dis'tance beyond the facexo'f the kneeja s indicated at 19;itwi1'i be ap'paren'tithat the crank 8" assumes the-fall line position and: "that" by re son. oft h" Iink v 14, the stop'arm is, while moving in response to the movement of the crank 8, never- I 'theless' held so that its stop element 17 forms a square abutment todirectly and flatly engage the stop 18 on the head block. If the frame has "operated to adjust the dogs to their maximum position, as indicated'at 20,

' the free end of the'crank 8 will, of course,

- movetoward the face ofthe knee, but by reason of the crank link '14, the-angular relation of the arm 12 to the plane of the head block will not be altered and hence the stop arm 11 is maintained in exactly-the same position as in the previous arrangement of the dogs, that is, With its stop element 17 providing a square abutment for the head blockstop 18. Thus, by reason of the mounting of the stop element. 10, the stop arm 11 is'maintained'in the same angular relationwith respect to the head block in all adjustments ofv the dog carryingframe relative to the face of the knee. Therefore, in any position ofthe stop arm, there is the maximum effective stop contact between the adjustable stop element of said arm and the head block stop. Of course, it is understood that when the stop element 17 of the stop arm 11 cooperates with the stop 18 on the head block and the a knee continues to advance, the dogs, by rea son of the rearward shifting of the frame with respect to the face of the knee, are gradually withdrawn from their then projected position. That is to say, the move- 7 f ment of the dogsis interrupted at a point before such dogs would otherwise cross the saw line and the dogs can no longer advance with the knee and there is .no possibility of damage resulting from the dogs crossing 'at' all times at substantially right angles the saw line. I

The effective function of'the stop arm held to the head block insures not only an effective cooperation of the stop arm with the head.

' block stop but maintains exactly this same cooperation during the further advance of the knee and during the withdrawal of the dogs. Where the stop arm is a rigid portion 7 of the crank, the an ular relation of said arm is continually c anged as the crank moves relative tothe knee during the with drawal of the dogs, and thus there is at best I i a slight'sliding cooperation between the stop armjand head block stop-while the dogs are being Withdrawn in those, forms where the proj ection or stop arm is rigid with the crank.

f In the present form, however, theposition of the stop arm with respect to the head -bl'ock, that is, the relative angular relation 7 c0 does not changein the relative movements of of thesefpart's, is at all times constant and the cranks either for positioning the dogs or in the automatic withdrawal of the dogs through the stop cooperation. Therefore, the stop is not only absolutely effective as a limiting means for the movement of the dogs toward the saw line but insures that the dogs, when once interrupted, will not be permitted further advance movement even to the slightest-degree, for the contact between the stop arm and head block stop is at direct right-angles to the plane of movement of the knee, and "remains in such relation in all possible positionsof the parts. This result,

of course, is secured byreason ofthe fact that the stop armproper is mounted for free rota-- tion with respect to the frame operating cranks but is controlled in this rotation by acrank having an exactly "corresponding movement to that ofthe frame crank. This parallel motion of the 'cranks insures that the, stop arm will remain in exactly the same position with respect to the head block in all relative positions of the frame operating crank.

What is claimed to be new is:

1. In a saw mill carriage, a knee, a dog mounting, cranks connecting the dog mounting and knee to permit movement of the mounting toward and from the face of the knee, dogs carried by the mounting, a stop "on the carriage, an arm carried by one of the knee, dogs carried by the mounting, a stop on the carriage, an arm carried by one of said cranks and bodily movable longitudinally of the knee, and means positively connecting the arm and kneeto cause the successive positions of the arm to be substantially parallel one with the other, a stop carried by the arm to engage the stop on the carriage, the successive parallel positions of the arm maintaining the stop on the arm in position to directly engage the stop on the carriage in all positions of the arm. 1

3. In a saw mill carriage, a knee, a dog mounting, cranks connecting the dog mounting and knee to permit movement of the mounting toward and fromthe face of the knee, dogs carriedbythe mounting, a stop on the carriage, an arm for cooperation with said stop, sai-d arm being movably carried by one of the cranks to insure bodily movement of the arm longitudinally of the knee in the movement of the crank, and link mechanism connecting the arm and knee to maintain the arm in a substantially vertical plane with respect to the knee during such bodily movement.

4. In a saw mill carriage, a knee, a dog mounting, cranks connecting the dog mountingand knee to permit movement of the mountingtoward and from the face of the knee; dofgs carried by the mounting, a; stop V on: the carriage, anangle lever mov'ably sup ported by one of the cranks and bodily movable longitudinall ofthe knee in response to crank movement, one arm" of said lever forming a'g-sto'p arm to cooperate Withthe carriage stop, and a'link'conneotilig the free end of the remaining arm with the knee, said link serving-to maintain said arm in a substantially vertical position with respect to the knee throughout the bodily movement of the angle lever responsive to crank movement. 7

In testimony whereof I aflix my signature. 'GEORGE M. PELTON.

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